Sound waves

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Questions

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• Why do sound waves need a medium?
• Why are sound waves in air characterized as longitudinal?
• What sound waves can humans hear?
• How do sound waves travel through solids?
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• What are the properties of sound waves?
• Why are sound waves called pressure waves?
• What is the difference between note and tone of a sound?
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• A sound wave has a frequency of 245 Hz and a wavelength of 1.0 m. What is the speed of the sound wave in air?
• Which of these frequencies is resonant with that of an ideal #"256 Hz"# tuning fork?
• A plane sound wave in air at 20°C, with wavelength 0.645 m, is incident on a smooth surface of water at 25°C, at an angle of incidence of 3.65°. How do you determine the angle of refraction for the sound wave and the wavelength of the sound in water?
• What happens to sound when reflection, refraction, and absorption occur?
• How do sound waves travel by refraction?
• A sound wave traveling at 343 m/s is emitted by the foghorn of a tugboat. An echo is heard 2.60 s later. How far away is the reflecting object?
• In a large ripple tank, a wave producing machine working at a frequency of 30 Hz produces 25 complete waves in a distance of 0.5 m. What would be the velocity of an individual wave? Thanks!
• How does sonar work?
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• Why do sound waves travel fastest in solids rather than in liquids or gases?
• When a sound source approaches you, how does the pitch change?
• Two tuning forks are played at the same time. One has a frequency of 176 Hz and the other is 178 Hz. How many beats per second are heard?
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• What does sonar equipment measure?
• An earthquake originating in Edmonton, Alberta, Canada produces a wave that has a period of 0.23 seconds and a wavelength of 57 m. ?
• Sound travel from air to water. the velocity of sound waves in air is 332m/s and wavelength is 2m. if the wavelength of sound in water is 850cm, find its velocity in water?
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• Sound does not travel in space. ('In space, no-one can hear you scream', as the tag line for 'Alien' went...) What would happen to the sound energy if, say, an astronaut decided to play a guitar during a space-walk?
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• Why does consonance have a higher quality of sound (timbre) than dissonance?
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• What type of wave is sound?
• Astudent hears a police siren. What would change the frequency that the student hears?